> For the complete documentation index, see [llms.txt](https://emotiv.gitbook.io/epoc-flex-user-manual/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://emotiv.gitbook.io/epoc-flex-user-manual/controller/controller-assembly.md).

# Controller Details

![](/files/-LvOQyPDgfXPOznL-QxH)

The EPOC Flex controller pictured above has 16 channels on the left + CMS input and 16 channels on the right + DRL output. These channels are connected in two rows A-H and J-Q with the position above the CMS/DRL empty. The power switch is located next to the USB connector on the bottom edge of the unit, turn it to the right to turn on and left to turn it off. There is a multifunctional LED located below the logo to indicate charging or power on.


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